Project Summary

Hoyle Tanner provided design and permitting services to the City of Concord for the widening and reconstruction of Manchester Street (US Route 3). The corridor is a mile and half long, two-lane roadway through an urban strip environment which not only services the local commercial establishments but also acts as a commuter route to the airport, I-93 and the City’s downtown. 

The project was a multiphase effort involving acquisition of Right-of-Way, moving utility lines, realigning Airport Road to create a signalized intersection, replacing the drainage system, waterlineswaterlines, and sewer lines, and reconstructing the roadway with new box and pavement materials. The roadway was widened to one lane in both directions with a dedicated left turn lane (three lane configuration) for part of the corridor and to two lanes in both directions with a dedicated left turn lane (five lane configuration) in the rest of the corridor. The Right-of-Way acquisition, utilities and roadway geometry were designed to prepare the City for the potential addition of two additional lanes to accommodate future traffic volumes.  

The complex urban drainage system not only collects the roadway runoff and abutter stormwater but also meets the NHDES Alteration of Terrain Permit requirements. Treatment and detention were provided by subsurface infiltration galleries designed as a component of the roadway drainage system which required extensive utility coordination to avoid conflicts.